FreeBSD Errata Notice FreeBSD-EN-19:02.tcp

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FreeBSD-EN-19:02.tcp Errata Notice
The FreeBSD Project
Topic: TCP connections may stall and eventually fail in case of
packet loss
Category: core
Module: kernel
Announced: 2019-01-09
Credits: Michael Tuexen
Affects: FreeBSD 12.0
Corrected: 2018-12-23 09:48:36 UTC (stable/12, 12.0-STABLE)
2019-09-09 18:42:40 UTC (releng/12.0, 12.0-RELEASE-p2)
For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.FreeBSD.org/>.
I. Background
The TCP stack limits the resources used for TCP connections. Once a limit
is reached, further received TCP segments for the TCP connection are dropped.
II. Problem Description
To continue delivering data to the application, accepting the TCP segment
with the next expected sequence number is required. If this TCP segment is
dropped due to a resource limit, no further progress can be made. Therefore
exceptions for this particular TCP segment have to be implemented.
III. Impact
In case of lost TCP segments, TCP connections may stall and then eventually
fail.
IV. Workaround
No workaround is available.
V. Solution
Perform one of the following:
1) Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.
Afterward, reboot the system.
2) To update your system via a binary patch:
Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
Afterward, reboot the system.
3) To update your system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
[FreeBSD 12.0]
# fetch https://security.FreeBSD.org/patches/EN-19:02/tcp.patch
# fetch https://security.FreeBSD.org/patches/EN-19:02/tcp.patch.asc
# gpg --verify tcp.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/12/ r342378
releng/12.0/ r342894
- -------------------------------------------------------------------------
To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:
# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-19:02.tcp.asc>
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